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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for Android. Android ships with a stripped-down version of Bouncy Castle - this causes classloader collisions if you try to add an alternative (updated/complete) Bouncy Castle jar. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5.

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package org.spongycastle.math.ec;

import java.math.BigInteger;

/**
 * Interface for classes encapsulating a point multiplication algorithm
 * for ECPoints.
 */
interface ECMultiplier
{
    /**
     * Multiplies the ECPoint p by k, i.e.
     * p is added k times to itself.
     * @param p The ECPoint to be multiplied.
     * @param k The factor by which p i multiplied.
     * @return p multiplied by k.
     */
    ECPoint multiply(ECPoint p, BigInteger k, PreCompInfo preCompInfo);
}